need help on this hw question
Scubadiving trips
The mailing list of an agency that markets scubadiving trips to the Florida Keys contains 60% males and 40% females.
The agency calls 30 people chosen at random from its list.
What is the probability that 20 of the 30 are men?
1 answer

Health Care: Flu Based on data from the Statistical Abstract of the United States, 112th Edition, only about 14% of senior citizens (65 years old or older) get the flu each year. However, about 24% of people under 65 years old get the flu each year. The general population consists of 12.5% senior citizens (65 years old or older).
(a) What is the probability that a person selected at random from the general population is a senior citizen who will get the flu this year?
(b)What is the probability that a person selected at random from the general population is a person under age 65 who will get the flu this year?
(c) Answer parts (a) and (b) for a community that has 95% senior citizens.
(d) Answer parts(a) and (b) for a community that has 50% senior citizens.